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- /*------------------------------------------
- ABOUT2.C -- About Box Demo Program No. 2
- (c) Charles Petzold, 1998
- ------------------------------------------*/
-
- #include <windows.h>
- #include "resource.h"
-
- LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
- BOOL CALLBACK AboutDlgProc (HWND, UINT, WPARAM, LPARAM) ;
-
- int iCurrentColor = IDC_BLACK,
- iCurrentFigure = IDC_RECT ;
-
- int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
- PSTR szCmdLine, int iCmdShow)
- {
- static TCHAR szAppName[] = TEXT ("About2") ;
- MSG msg ;
- HWND hwnd ;
- WNDCLASS wndclass ;
-
- wndclass.style = CS_HREDRAW | CS_VREDRAW ;
- wndclass.lpfnWndProc = WndProc ;
- wndclass.cbClsExtra = 0 ;
- wndclass.cbWndExtra = 0 ;
- wndclass.hInstance = hInstance ;
- wndclass.hIcon = LoadIcon (hInstance, szAppName) ;
- wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
- wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
- wndclass.lpszMenuName = szAppName ;
- wndclass.lpszClassName = szAppName ;
-
- if (!RegisterClass (&wndclass))
- {
- MessageBox (NULL, TEXT ("This program requires Windows NT!"),
- szAppName, MB_ICONERROR) ;
- return 0 ;
- }
-
- hwnd = CreateWindow (szAppName, TEXT ("About Box Demo Program"),
- WS_OVERLAPPEDWINDOW,
- CW_USEDEFAULT, CW_USEDEFAULT,
- CW_USEDEFAULT, CW_USEDEFAULT,
- NULL, NULL, hInstance, NULL) ;
-
- ShowWindow (hwnd, iCmdShow) ;
- UpdateWindow (hwnd) ;
-
- while (GetMessage (&msg, NULL, 0, 0))
- {
- TranslateMessage (&msg) ;
- DispatchMessage (&msg) ;
- }
- return msg.wParam ;
- }
-
- void PaintWindow (HWND hwnd, int iColor, int iFigure)
- {
- static COLORREF crColor[8] = { RGB ( 0, 0, 0), RGB ( 0, 0, 255),
- RGB ( 0, 255, 0), RGB ( 0, 255, 255),
- RGB (255, 0, 0), RGB (255, 0, 255),
- RGB (255, 255, 0), RGB (255, 255, 255) } ;
-
- HBRUSH hBrush ;
- HDC hdc ;
- RECT rect ;
-
- hdc = GetDC (hwnd) ;
- GetClientRect (hwnd, &rect) ;
- hBrush = CreateSolidBrush (crColor[iColor - IDC_BLACK]) ;
- hBrush = (HBRUSH) SelectObject (hdc, hBrush) ;
-
- if (iFigure == IDC_RECT)
- Rectangle (hdc, rect.left, rect.top, rect.right, rect.bottom) ;
- else
- Ellipse (hdc, rect.left, rect.top, rect.right, rect.bottom) ;
-
- DeleteObject (SelectObject (hdc, hBrush)) ;
- ReleaseDC (hwnd, hdc) ;
- }
-
- void PaintTheBlock (HWND hCtrl, int iColor, int iFigure)
- {
- InvalidateRect (hCtrl, NULL, TRUE) ;
- UpdateWindow (hCtrl) ;
- PaintWindow (hCtrl, iColor, iFigure) ;
- }
-
- LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
- {
- static HINSTANCE hInstance ;
- PAINTSTRUCT ps ;
-
- switch (message)
- {
- case WM_CREATE:
- hInstance = ((LPCREATESTRUCT) lParam)->hInstance ;
- return 0 ;
-
- case WM_COMMAND:
- switch (LOWORD (wParam))
- {
- case IDM_APP_ABOUT:
- if (DialogBox (hInstance, TEXT ("AboutBox"), hwnd, AboutDlgProc))
- InvalidateRect (hwnd, NULL, TRUE) ;
- return 0 ;
- }
- break ;
-
- case WM_PAINT:
- BeginPaint (hwnd, &ps) ;
- EndPaint (hwnd, &ps) ;
-
- PaintWindow (hwnd, iCurrentColor, iCurrentFigure) ;
- return 0 ;
-
- case WM_DESTROY:
- PostQuitMessage (0) ;
- return 0 ;
- }
- return DefWindowProc (hwnd, message, wParam, lParam) ;
- }
-
- BOOL CALLBACK AboutDlgProc (HWND hDlg, UINT message,
- WPARAM wParam, LPARAM lParam)
- {
- static HWND hCtrlBlock ;
- static int iColor, iFigure ;
-
- switch (message)
- {
- case WM_INITDIALOG:
- iColor = iCurrentColor ;
- iFigure = iCurrentFigure ;
-
- CheckRadioButton (hDlg, IDC_BLACK, IDC_WHITE, iColor) ;
- CheckRadioButton (hDlg, IDC_RECT, IDC_ELLIPSE, iFigure) ;
-
- hCtrlBlock = GetDlgItem (hDlg, IDC_PAINT) ;
-
- SetFocus (GetDlgItem (hDlg, iColor)) ;
- return FALSE ;
-
- case WM_COMMAND:
- switch (LOWORD (wParam))
- {
- case IDOK:
- iCurrentColor = iColor ;
- iCurrentFigure = iFigure ;
- EndDialog (hDlg, TRUE) ;
- return TRUE ;
-
- case IDCANCEL:
- EndDialog (hDlg, FALSE) ;
- return TRUE ;
-
- case IDC_BLACK:
- case IDC_RED:
- case IDC_GREEN:
- case IDC_YELLOW:
- case IDC_BLUE:
- case IDC_MAGENTA:
- case IDC_CYAN:
- case IDC_WHITE:
- iColor = LOWORD (wParam) ;
- CheckRadioButton (hDlg, IDC_BLACK, IDC_WHITE, LOWORD (wParam)) ;
- PaintTheBlock (hCtrlBlock, iColor, iFigure) ;
- return TRUE ;
-
- case IDC_RECT:
- case IDC_ELLIPSE:
- iFigure = LOWORD (wParam) ;
- CheckRadioButton (hDlg, IDC_RECT, IDC_ELLIPSE, LOWORD (wParam)) ;
- PaintTheBlock (hCtrlBlock, iColor, iFigure) ;
- return TRUE ;
- }
- break ;
-
- case WM_PAINT:
- PaintTheBlock (hCtrlBlock, iColor, iFigure) ;
- break ;
- }
- return FALSE ;
- }
-